Find in Library

In populational sampling it is vitally importantto clarify and discern: first, the design orsampling method used to solve the researchproblem; second, the sampling size, taking intoaccount different components (precision, relia-Recibido: Marzo 22 de 2006.Aceptado: Abril 18 de 2006.*Docente Investigador, Investigación Universidad delRosario.bility, variance); third, random selection andfourth, the precision estimate (sampling errors),so as to determine if it is possible to infer theobtained estimates from the target population.The existing difficulty to use concepts fromthe sampling theory is to understand them withabsolute clarity and, to achieve it, the help fromdidactic-pedagogical strategies arranged as conceptual“mentefactos” (simple hierarchic diagramsorganized from propositions) may proveuseful. This paper presents the conceptual definition,through conceptual “mentefactos”, of themost important populational probabilistic samplingconcepts, in order to obtain representativesamples from populations in health research.